.chal-ttile{
    text-align: center !important;
    font-family: 'Raleway', 'RalewayOffline', sans-serif;
    font-weight: 500;
    letter-spacing: 2px;
    font-size: 2rem;
    line-height: 1.2;
    color: black;
    margin-bottom: .5rem;

    /*外边距*/
    padding-left: 20px;
    padding-right: 20px;
}
.chal-point{
    text-align: center !important;
    font-size: 1.75rem;
    /*标题公共部分*/
    margin-bottom: .5rem;
    font-family: inherit;
    font-weight: 500;
    line-height: 1.2;
    color: black;
    margin-top: 0;
    pointer-events: auto;

    /*外边距*/
    padding-left: 20px;
    padding-right: 20px;
}
.chal-description{
    padding-left: 20px;
    padding-right: 20px;
    font-size: 14px;
    pointer-events: auto;
    font-family: 'Lato', 'LatoOffline', sans-serif;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: left;

}
.link{
    margin-bottom: 30px;

    /*外边距*/
    padding-left: 20px;
    /*padding-right: 20px;*/
}
#link-font{
    color:#5B7290;
    font-weight: 600;
    font-size: 14px;
}
.submit-row{
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-wrap: wrap;
    flex-wrap: wrap;
    margin-right: -15px;
    margin-left: -15px;
    box-sizing: border-box;
    pointer-events: auto;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    text-align: left;
}
.flag-form{
    margin-bottom: 1rem;
    -webkit-box-flex: 0;
    -ms-flex: 0 0 75%;
    flex: 0 0 75%;
    max-width: 75%;
    position: relative;
    width: 100%;
    min-height: 1px;
    padding-right: 15px;
    padding-left: 35px;
    box-sizing: border-box;


}
.flag-submit{
    margin-bottom: 1rem;
    -webkit-box-flex: 0;
    -ms-flex: 0 0 25%;
    flex: 0 0 25%;
    max-width: 25%;
    position: relative;
    width: 100%;
    min-height: 1px;
    padding-right: 35px;
    padding-left: 15px;
    box-sizing: border-box;
    pointer-events: auto;

}
.flag-submit-control{
    height: 51px;
    color: #868e96;
    background-color: transparent;
    opacity: .65;
    letter-spacing: 1px;
    text-decoration: none;
    -moz-user-select: none;
    border-radius: 0;
    cursor: pointer;
    display: inline-block;
    margin-bottom: 0;
    vertical-align: middle;
    white-space: nowrap;
    font-size: 14px;
    line-height: 20px;
    font-weight: 700;
    padding: 8px 20px;
    float: right !important;
    background-image: none;
    border-color: #868e96;
    transition: color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
}

.flag-control {
    display:block;
    position: relative;
    width:100%;
    padding:0.8em;
    font-size:1rem;
    line-height:1.5;
    color:#495057;
    box-sizing: border-box;
    background-color:#fff;
    background-clip:padding-box;
    border:1px solid #ced4da;
    transition:background-color 0.15s ease-in-out,box-shadow 0.15s ease-in-out 0s;
}
.flag-control::-ms-expand {
    background-color:transparent;
    border:0
}
/*focus选择器*/
.flag-control:focus {
    color:#495057;
    background-color:#fff;
    border-color:#A3D39C;
    outline:0;
    box-shadow:0 0 0 .2rem rgba(163,211,156,1)
}
.flag-control::-webkit-input-placeholder {
    color:#868e96;
    opacity:1
}
.flag-control::-moz-placeholder {
    color:#868e96;
    opacity:1
}
.flag-control:-ms-input-placeholder {
    color:#868e96;
    opacity:1
}
.flag-control::placeholder {
    color:#868e96;
    opacity:1
}
.flag-control:disabled,.flag-control[readonly] {
    background-color:#e9ecef;
    opacity:1
}
select.flag-control:not([size]):not([multiple]) {
    height:calc(2.25rem + 2px)
}
select.flag-control:focus::-ms-value {
    color:#495057;
    background-color:#fff
}
.flag-control-file,.flag-control-range {
    display:block;
    width:100%
}

.flag-submit-control {
    display:inline-block;
    font-weight:400;
    text-align:center;
    white-space:nowrap;
    vertical-align:middle;
    -webkit-user-select:none;
    -moz-user-select:none;
    -ms-user-select:none;
    user-select:none;
    border:1px solid transparent;
    padding: 0.8em;
    font-size:1rem;
    line-height:1.5;
    transition:color .15s ease-in-out,background-color .15s ease-in-out,border-color .15s ease-in-out,box-shadow .15s ease-in-out;
    float:right!important
}

.flag-submit-control-secondary {
    color:#868e96;
    background-color:transparent;
    background-image:none;
    border-color:#868e96
}
.flag-submit-control-secondary:hover {
    color:#fff;
    background-color:#868e96;
    border-color:#868e96
}
.flag-submit-control-secondary.focus,.flag-submit-control-secondary:focus {
    /*box-shadow:0 0 0 .2rem rgba(134,142,150,.5)*/
}
.flag-submit-control-secondary.disabled,.flag-submit-control-secondary:disabled {
    color:#868e96;
    background-color:transparent
}
.flag-submit-control-secondary:not([disabled]):not(.disabled).active,.flag-submit-control-secondary:not([disabled]):not(.disabled):active,.show>.flag-submit-control-secondary.dropdown-toggle {
    color:#212529;
    background-color:#868e96;
    border-color:#868e96;
    box-shadow:0 0 0 .2rem rgba(134,142,150,.5)
}



.row {
    display:-webkit-box;
    display:-ms-flexbox;
    display:flex;
    -ms-flex-wrap:wrap;
    flex-wrap:wrap;
    background-color: white;

}
.col-md-12{
    /*position:relative;*/
    width:100%!important;
    min-height:1px;
    padding-right:20px;
    padding-left:20px;
    padding-bottom: 20px;

}
.alert-normal{
    text-align:center!important;
    width:100%!important;
    position:relative;
    padding-top: 12px;
    padding-bottom: 12px;
}
.alert-normal-correct{
    background-color: #D4EDDA;
}
.alert-normal-incorrect{
    background-color: #F8D7DA;
}
.alert-normal-solved{
    background-color: #D1ECF1;
}
.result-message-correct{
    font-weight: bold;
    color: #155724;
}
.result-message-incorrect{
    font-weight: bold;
    color: #721c24;
}
.result-message-solved{
    font-weight: bold;
    color: #0C5477;
}